Ok so I just got some new components to put in my system, a gtx 760, deep cool gammaxx 300 and a antec 520w high current gamer power supply. I installed all the components and everything was running perfectly for a day, but the next day whilst playing crysis 2 it shutdown randomly with no warning and won't turn back on. The motherboard light is on and the graphics card is receiving power but the computer won't turn on. It turns on for half a second then turns off again when I press the power button. The CPU I am using is the i5 3570k and it's not over clocked, the motherboard is an asus p8h61-mx. When I installed the up cooler I did not clean off the CPU's thermal paste and didn't apply any new thermal paste to the cooler as it came per applied with the paste. Any help would be awesome, thanks